interface IXP
{
    string XP();
}

class People
{
    public string 纯爱() => "纯爱";
}

class NtrPeople : People, IXP
{
    public string XP() => $"我是牛头人, 我不喜欢{base.纯爱()}";
}

void ShowXp(IXP xp)
{
    Console.WriteLine(xp.XP());
}

People people = new();
NtrPeople ntr_people = new();

//ShowXp(people);  编译无法通过
Console.WriteLine(people.纯爱());
ShowXp(ntr_people);